ADS1255IDB Burr-Brown Corporation, ADS1255IDB Datasheet - Page 32

• Manufacturer Part Number: ADS1255IDB
• Description: Very Low Noise/ 24-Bit Analog-to-Digital Converter
• Manufacturer: Burr-Brown Corporation

ADS1255
ADS1256
SBAS288D − JUNE 2003 − REVISED AUGUST 2004
DRATE: A/D Data Rate (Address 03h)
Reset Value = F0h
The 16 valid Data Rate settings are shown below. Make sure to select a valid setting as the invalid settings may produce
unpredictable results.
Bits 7-0 DR[7: 0]: Data Rate Setting
(1) for f CLKIN = 7.68MHz. Data rates scale linearly with f CLKIN .
I/O: GPIO Control Register (Address 04
Reset Value = E0h
The states of these bits control the operation of the general-purpose digital I/O pins. The ADS1256 has 4 I/O pins: D3, D2,
D1, and D0/CLKOUT. The ADS1255 has two digital I/O pins: D1 and D0/CLKOUT. When using an ADS1255, the register
bits DIR3, DIR2, DIO3, and DIO2 can be read from and written to but have no effect.
Bit 7
Bit 6
Bit 5
Bit 4
Bits 3-0 DI0[3:0]: Status of Digital I/O Pins D3, D2, D1, D0/CLKOUT
32
BIT 7
BIT 7
DIR3
DR7
11110000 = 30,000SPS (default)
11100000 = 15,000SPS
11010000 = 7,500SPS
11000000 = 3,750SPS
10110000 = 2,000SPS
10100001 = 1,000SPS
10010010 = 500SPS
10000010 = 100SPS
01110010 = 60SPS
01100011 = 50SPS
01010011 = 30SPS
01000011 = 25SPS
00110011 = 15SPS
00100011 = 10SPS
00010011 = 5SPS
00000011 = 2.5SPS
DIR3, Digital I/O Direction for Digital I/O Pin D3 (used on ADS1256 only)
0 = D3 is an output
1 = D3 is an input (default)
DIR2, Digital I/O Direction for Digital I/O Pin D2 (used on ADS1256 only)
0 = D2 is an output
1 = D2 is an input (default)
DIR1, Digital I/O Direction for Digital I/O Pin D1
0 = D1 is an output
1 = D1 is an input (default)
DIR0, Digital I/O Direction for Digital I/O Pin D0/CLKOUT
0 = D0/CLKOUT is an output (default)
1 = D0/CLKOUT is an input
Reading these bits will show the state of the corresponding digital I/O pin, whether if the pin is configured as an
input or output by DIR3-DIR0. When the digital I/O pin is configured as an output by the DIR bit, writing to the
corresponding DIO bit will set the output state. When the digital I/O pin is configured as an input by the DIR bit,
writing to the corresponding DIO bit will have no effect. When DO/CLKOUT is configured as an output and
CLKOUT is enabled (using CLK1, CLK0 bits in the ADCON register), writing to DIO0 will have no effect.
BIT 6
BIT 6
DIR2
DR6
BIT 5
BIT 5
DIR1
DR5
(1)
H
)
BIT 4
BIT 4
DIR0
DR4
BIT 3
BIT 3
DIO3
DR3
BIT 2
BIT 2
DIO2
DR2
BIT 1
BIT 1
DIO1
DR1
www.ti.com
BIT 0
BIT 0
DIO0
DR0